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Reversible and Irreversible Change

State whether...

Question

State whether the following statement is true or false.
Melting of ice is a chemical change.

A

True

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B

False

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Solution

The correct option is B False
The melting of ice is a physical change as no new substance is formed.
A change in which no new material is formed is called a physical change.
Hence the given statement is false.

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Q. Question 2(a)
State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.
Cutting a log of wood into pieces is a chemical change.

Q. State whether true or false :
Cutting a log of wood into pieces is a chemical change.

Q. State whether the following statements are true or false. Rewrite the false ones correctly.
(a) All irreversible changes are chemical changes.
(b) A liquid can sublime.
(c) The evaporation of water take place only at 100°C. when it is boiling.
(d) The melting of ice is a physical change.
(e) The souring of milk is a periodic change.
(f) The flowering of trees is a periodic change.
(g) Solidification and condensation are the same.
(h) The breaking of glass tumbler is a chemical change because it is irreversible.
(i) Boiling, evaporation and condensation are physical changes.

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

(a) Cutting a log of wood into pieces is a chemical change. (True/False)

(b) Formation of manure from leaves is a physical change.

(True/ False)

(c) Iron pipes coated with zinc do not get rusted easily. (True/False)

(d) Iron and rust are the same substances. (True/False)

(e) Condensation of steam is not a chemical change. (True/False)

Statement: The melting point of ice changes markedly with pressure.

State whether the given statement is true or false.

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